I had a 55 van ,an ex post offive escort on a 51 plate,had a 250 litre tank in it,struggles with that so would'nt go above 250,I found the upright tank was better as with the flat tank it had rocked the van when stopping at juntions as for rust there was'nt a problem,I still see the van now and again and is in very good nick,I find Fords newer vans rust like anything.